Furnace



Sept. 4, 1923.

s. F. SHAFER FURNACE Filed Dec. 8, 1919 3 Sheets-Sheet 2 Jfffffy? akkonsua Sept. 4, 1923.

s. F. SHFER FURNACE Filed Deo. 8, 1919 I5 Sheets-Sheet 5 temperature,

Pares-rad sept. 4, 1923.

@FFH CE SAMUEL F. SHAFER, 0F TACOMA, WASHINGTON.

FURNACE.

. Application led December 8, 1919. Serial No. 343,277.

To all whom z't may concern.'

' Be itlmown that I, SAMUEL F. SHAFER, a citizen of the United States, residin at Tacoma, in the county'vofV Pierce and tate of ,Washingtom have invented a new and useful F urnaceof which the following is a specification. ,v

l By way of explanation it may be stated that, in a'furnace, as ordinarily constructed, thel air to be heated, on the one hand, and the products of combustion, on the other lhand, move upwardly together. As a' 'consequence, the air can be no hotter than the products of combustion, at the time the roducts of combustion enter the stack. l'ghe foregoing being understood, one object l'of the invention is to provide afurnace so 'constructed that the air to be heated will 'move upwardly, the products of combustiony moving downwardly, the air may move to the right when the products of combustion move to the left.

In any event, the air comes under lthe muence Vofthe products of combustion, at the time that the products are at the highest and just before the air is peror stated differently,

y' mitted to pass from the furnace.

It is within thejprovincel of the disclosureto improve generally and to enhance the utility of devices of that type to which the invention appertains.

` In the drawings Figure 1 shows in longitudinal section, a hot air furnace constructedin accordance with the invention; Figure 2 is a cross section onthe line 2 2 of Figure. 1, distant parts. being omitted; Figure 3 is a cross'sectiorron the line 3 3 vof Figure l; Figure 4 is aV cross section on the line 4 4 of Figure 1; and Figure 5 is a fragmental horizontal 4sectionillustrating the Structure delineated in Figure 4.y

`Referring to FiguresY 1, 2 and 3, the nucasing embodying a front wall 31. f` Adjacent to its 1* carries a hood 2 from pipes 3 adapted to convey the heated air tov the points of application. A

Ywall 4 extends entirely across 'the casing 1. `Awall extends partfway across the casing, and is located inv front of the wall 4.

Sds 8 eXeIld between the front wall 21 Yfai'rdthe wall 4. TA top Vplate 6 vconnects the 'Y wall-'21 with the wall fandthe wall" 4. The

V berisidefned, the

'-fc'onstruct'ion is such that a.' combustion charnsides 8 of the combustion 4rear wall 31 of the fers '34, the rear ends chamber beingspaced from the sides of the casing 1.

The furnace embodies an ash pit 9, and fromthe ash pit, a passage 10 leads upwardly, this passage being bounded by the walls 4 and 5`and by the rear portions of the sides 8. The furnace includes a fire pot 12 having a grate 14. The stoke door is denoted at 16, the ash door being shown at 15. An air flue 11 extends downwardly between the combustion chamber and the side wall of the casing 1, one end 7 0 ing into the combustion chamber through the top 6, and the other end 71 of the air flue communicating with the atmosphere through the said side wall of the casing. The front wall 21 outwardly as shown at 201, adjacent to the fire pot 12, the space thus defined communieating with the spaces which exist between the sides 8 of the combustion chamber and the sides of the casing 1.

A' baffle plate 17 extends across the casing 1 from side `to side and projects rearwardly from the wall or partition 4. A baffle plate 18 is locatedbelow the baffle plate 17 and projects forwardly from the casing. v

A box-like header-19 is carried by the rear wall 31 ofthe casing and extends transversely thereof, the header' 19 being supplied with clean out closures 20 giving access not only to the header but, as well, to pipes 25 hereinafter mentioned. A pipe 28 leads from the top of the header 19 to a stack 29. The rear wall 31 of the casing terminates adjacent to the bottom of the header 19, so that, at the lower end of the casing and at the back thereof, there exists an air inlet opening 22.

Pipes 23 extend between the partition 4 of the air flue openl and the rear wall 31, the pipes communicatv ing at their forward of the pipes 23 are stopped by clean out closures 33. The ends of pipes 24, located below the pipes 23, are carried by the partition 4 and the rear wall 31. Pipes 25, located below the pipes 24 are mounted at their forward'ends in thev partition 4, the rear ends of the pipes 25being carried by thewall 31 and communicating with'the header 19. The forward ends of the pipes 25 and 24 are controlled by dampof the pipes 24 being stopped by clean out closures 33 ofthe sort hereinbefore mentioned in connection with the `pipes 23. The pipes 23 and 24 are a communica-tion between rthe upper portion of the passage 10 and the header '19. Y From the center pipe 23, a branch 30 leads to the stack 29, the branch 30 containing a damper 32. From the branch 30, elbows 40 lead to the side pipes 23.A The wall 5 is provided with an opening 36,'communicating with the 'passage 10 and controlled by a damper 35.

Let it be supposed that the dampers 35, 34and 32 are closed. Then the operation of the structure is as follows Air enters the 'combustion chamber 'b'y way vof theair flue 11 air being admitted into the flue `at the lower end 71 thereof, and

being discharged into the combustion chamber at the upper end of the iiue. The air thus admitted passes downwardly through the'fire pot 12, the products of combustion passing downwardly into the ash pit 9 and moving upwardly through the passage 10;'

The products then enter the pipes 23 and traverse the parts 24, 26 and 25, the products entering the header 19 and passing into the stack 29 by way of the pipe 28. Air enters the casing 1 through the opening 22 in the rear lower portion of the casing. The air moves upwardly around the forward end ofY the lower baille 18, around the rear end ofthe upper baffle 17 and, ultimately. enters the hood 2 and leaves by way of the pipes -3 to the points of use. Obviously, the air moving as described, comes in contact with the sinuous flues formed by 'the parts 23-27-2426-25 and is heated thereby. Just before the air enters the hood 2, the air comes into contact with the hottest parts of the pipe 23, owing to the fact that there is a down draft of the products of combus tion, and an up draft ofthe fresh air. If desired, the dampers 32 and 35 may be opened, and then there will be a check dra-tt from the combustion chamber 8 above the fire pot 12 to the passage 10, through the pipes 23 into the stack 29, by way of the elbows 40 and the branch 30. The lower damper 34 may be opened, thereby creating a draft from the passage 10 to the header 19,7'the pipes 28 and the stack 29, through the pipes 25 only. lThe lowermost damper may be closed, and the uppermost dampers at the inner ends of the pipes 24 may be opened, whereupon there will be a draft from the passage 10 through the pipes 24, the connections 26 and the pipes 25. The operatonrtherefore, has under his control` a means whereby the regulated or adjusted portions of the sinuous ue 234427-24- 26-25 .may be subjected 'to the 'products of combustion, the heating area being regu- Ylated accordingly.

Having thus what is claimed is Yl. In a device of the class described, a casing embodying a front wall, a rear wall, sides and a top, 'the lower rear portion of the casing having an inlet for cold air, and the upper front portion of the casing' having Van outlet for heated air; a 'transverse wall extended entirely across the casing from side to side and spaced at its :upperv edge from the 'topfof the casing; Yay combus- 'ti'on chamber in the casing and located ,in Vfront, of the transverse wall, the 'sides ofthe chamberbeing 'spaced 'from the sides -of the casing, the chamber terminating short of the bottom of the casing, and being VYspaced from the transverse wall to form apassage communicating with the Yspace below the 'combustion chamber and closed V'at itsA top an air flue opening at its upper end. into the combustion chamber and .e lextended downwardly between onesde of the casing and the corresponding side of the chamber, the flue communicating at its lower end with lthe atmosphere', a vstack at the rear of the casing;V a header kextended across the rear end of the casing; a communication between the header and the stack; sinuous flues opening at their lower rear endsinto the header and opening at their upper forward Vends into said passage,`the intermediate portions of the flues communicating with said passage; dampers controlling A'the points of communication between the sinuous lues and the passage.; a damper controlling the iow of the products of combustion from the combustion chamber directly into the passage; `a pipe connecting the upper portions of the sinuous flues with the stack; and a damper'in the pipe.

2. 1n a device of the class described, a casing embodying a front wall, a rear wall, sides and a top, the lowerprear portion of the casing having an inlet for cold air, and the upper front portion of the casing having an outlet for heated air; a transverse wall extended entirely across` the casing from side to side and spaced at its upper edge from the topV of the casing; a combustion chamber inthe casing and located in front of the transverse wall, thesides of the chamber being spaced from thesides of the.V casing,r the chamber'terminatingv short of the bottom of thecasing, and being described the invention,

spaced from the transverse wall to form a Apassage communicating with the spacbe'- low the combustionchamber and closed at its top M1.- r flue LOpening at its upper and into the vcombustion chamber and nextended downwardly between onexside of the casing' r andthe `corresponding side of the chamber, the air lue communicating at its lower end with the atmosphere; a stack at the rear of in direct communication with said passage, the casing; a sinuous Hue in the casing, the at the will of an operator. Hue communicating at its upper forward In testimony that I claim the foregoing end with said passage; means for establishas my own, I have hereto aHiXed my signa- 5 ing communication between the lower rear ture in thel presence of two witnesses. Y end of the Hue and the stack; damper means for placing the intermediate portion of the SAMUEL l' SHAFER Hue in communication with said passage, Vitnesses: at the will of an operator; and damper GEO. Gr. WILLIAMSON,

10 means for placing the combustion chamber ELLEN OROURKE. 

